On the study of the optical constants for different compositions of Sn x (GeSe)100−x thin films in terms of the electronic polarizability, electronegativity and bulk modulus

Aly, K.A.

doi:10.1007/s00339-015-9187-z

Cited by 40 publications

(4 citation statements)

References 48 publications

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Section: Resultssupporting

confidence: 64%

“…x at% ρ V m Pd 10 Furthermore, the decreased values of (n) due to Se additions may be attributed to the polarizability decrement [40], where Se atoms has a smaller size (atomic radius , ar =115 pm) than Ge (ar =125 pm) and Zn (ar =135 pm) atoms [41]. Similar results have been observed in the literature for Se-based thin films [40,[42][43][44]. The extent of electronic responses to the electromagnetic field applications in the electronic clouds is defined as the electronic polarizability, ( el a ) of this material.…”

Section: Resultsmentioning

confidence: 99%

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Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Ibraheem¹,

Aly²

2022

Phys. Scr.

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Different 〖(GeZn)〗_(100-x) 〖Se〗_x (9≤x≤25 at.%) chalcogenide films have been thermally evaporated onto cleaned glass substrates. The film transmission (T) and reflection (R) spectra have been measured over the wavelength spectral range (0.3-2.5 m). The composition dependence of the optical band gap (Eg) has been illustrated and interpreted in the light of the Mott and Davies Model (MDM). The linear correlation between the changes in the optical band gap (Eg) and in the band tail parameter (∆√B) confirmed the disorder's decrease, which explains the observed increase in Eg values with increasing Se concentrations. The dispersion and Sellmeier parameters have been determined and well discussed. A clear blueshift was observed throughout the observed decrease in values of o and no and the observed shift of the absorption edge to the short wavelengths. The GZS films are transparent in the visible, near- and far-infrared, which makes these glasses suitable for VIS and infrared applications.

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Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Ibraheem¹,

Aly²

2022

Phys. Scr.

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“…As well, they have good transparency, which extends from the mid to far-infrared region [6,7]. Furthermore, these glasses exhibit low phonon energy, high refractive index, and wide transmission range [8,9].…”

Section: Introductionmentioning

confidence: 98%

Physical and mechanical properties of ternary Ge-Se-Sb glasses for near-infrared applications

et al. 2021

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Many physical properties such as the average coordination number (CN), the compactness (δ), the overall bond energy (〈E〉), the cohesive energy (CE), the mean bond energy (E s), and the overall electronegativity difference (Δχ) as well as the degrees of ionicity (Ion) and covalency (Cov) were estimated theoretically. The chemical bond approach (CBA) was used to predict the type and proportion of the formed bonds in the studied glasses. Consequently, several structural and physical properties have been estimated. The results show that the studied glasses are rigidly connected, having an average coordination number increase from 2.41 to 2.61. Two approaches have been successfully used to estimate the band gap (E g) theoretically compared with the previously published experimental values for the Ge18Se82−xSbx (5 ≤ x ≤ 25 at. %) glasses. Values of E g decrease from 1.59 to 1.15 eV by an increase of the Sb content from 5 to 25 at. %. i.e. the wavelengths corresponding to E g values lie in the near-infrared range of spectra, which make these glasses candidates for the near-infrared applications. Furthermore, the ultrasonic longitudinal (v L ) and shear wave (v T ) velocities propagating through the glasses have been used to estimate the mechanical parameters such as the elastic bulk modulus, Poisson’s ratio, Young’s modulus, micro-hardness, and temperature of Debye. It was found that a change in slope occurs for various physical, mechanical, and structural properties near the stoichiometric composition (x ≈ 18 at. %) at which the glass structure consists of heteropolar bonds only.

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“…These glasses show different phenomena like photoluminescence, photo-darkening, photo-bleaching and change in phase (amorphous↔crystalline). Due to these phenomena, these materials become potential candidates for various technological applications such as: fiber optics [1], IR-sensors [2], holographic grating [3], non-linear optical devices [4], memory switching [5], optical data storage and phase change random access memory applications [6,7].…”

Section: Introductionmentioning

confidence: 99%

Linear and non-linear optical properties of Ag-doped Ge₂Sb₂Te₅thin films estimated by single transmission spectra

Singh

Sharma

et al. 2017

Semicond. Sci. Technol.

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In this paper we have studied the effect of Ag addition on linear and non-linear optical properties of thermally evaporated (Ge 2 Sb 2 Te 5 ) 100−x Ag x (x=0, 1, 3 and 10) thin films (thickness ∼700 nm) from single transmission spectra. Energy dispersive spectroscopy, x-ray diffraction and Raman spectroscopy were used to verify the composition, amorphous nature and structure of the fabricated thin films respectively. Swanpoel's method was used to calculate the thickness (d), refractive index (n) and extinction coefficient (k). The refractive index and extinction coefficient were used to obtain all linear and non linear optical parameters. The compositional dependence of the refractive index, extinction coefficient, volume energy loss function, surface energy loss function, dielectric constant, dielectric loss function, optical conductivity and third order nonlinear optical susceptibility were determined. All these optical parameters have minimum values for 3% Ag-doped Ge 2 Sb 2 Te 5 (GST). The decrease in measured optical parameters up to 3% Ag doping is due to a decrease in the density of localized states in the mobility gap. The increase in the optical parameters at 10% Ag doping was ascribed to the distortion of the host lattice, because incorporation of Ag has been done at the expense of Ge, Sb and Te. The optical parameters of the GST films were found to be strongly dependent upon Ag content. The results revealed that 3% Ag-doped GST is a promising candidate for phase change optical storage applications.

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On the study of the optical constants for different compositions of Sn x (GeSe)100−x thin films in terms of the electronic polarizability, electronegativity and bulk modulus

Cited by 40 publications

References 48 publications

Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Physical and mechanical properties of ternary Ge-Se-Sb glasses for near-infrared applications

Linear and non-linear optical properties of Ag-doped Ge₂Sb₂Te₅thin films estimated by single transmission spectra

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On the study of the optical constants for different compositions of Sn x (GeSe)100−x thin films in terms of the electronic polarizability, electronegativity and bulk modulus

Cited by 40 publications

References 48 publications

Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Optical and dispersion parameters of Ge-Zn-Se glassy films for VIS and FTIR Applications

Physical and mechanical properties of ternary Ge-Se-Sb glasses for near-infrared applications

Linear and non-linear optical properties of Ag-doped Ge2Sb2Te5thin films estimated by single transmission spectra

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Linear and non-linear optical properties of Ag-doped Ge₂Sb₂Te₅thin films estimated by single transmission spectra